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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49254 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Hajilouy-Benisi, Ali
- Abstract:
- For several decades, turbocharging of internal combustion engines has been a wide spreading technology to increase the engine output power as much as possible. Turbocharger has two main components: compressor, and turbine. Therefore, increasing the efficiency of turbine and compressor has a major role in engine performance improvement. This has been a continuous research goal in 20th century. Considerable advances has been achieved until now. Turbocharger turbine should be matched to engine in a wide range operation conditions with high efficiency. Many researchers have published their achievements considering turbine elements design improvements. This research is focused on the turbine casing aerodynamic investigation and design. For this purpose, a single entry radial inflow turbine of S2A model Schweitzer Turbocharger is chosen. Several steps of research are carried out on the turbine. First of all, the turbine geometry is measured accurately. An one dimensional modeling is performed for the turbine performance prediction based on the governing equations as well as empirical losses coefficients. Experimental investigations are carried out at Sharif University Turbocharger Lab. Constant speed measurements are performed in several conditions for three rotational speeds, i.e., 75000, 85000, and 95000 rpm to prepare the performance characteristics of the turbine, including efficiency and mass parameter variations versus pressure ratios. The 1D modeling results are compared with the experimental results, showing good agreement. Then, casing aerodynamic design is performed, using the non-dimensional method, witch yields 11% larger volute at the maximum point. Finally, one dimensional design procedure is carried out and volute A/R ratio is determined at all azimuth angles of the volute. Comparing the maximum A/R ratio of designed volute with that of existing volute, shows an increase from 0.43 to 0.46. The turbine performances are predicted with two volutes witch reveals an increase in efficiency as much as 1.6 percent for designed volute in compare with the next one when the speed is 75000 rpm. Considering energy losses of the volute and incidence angle of the rotor, show improvement with designed volute
- Keywords:
- Experimental Investigation ; Performance Prediction ; Single-Entry Radial Inflow Turbine ; Aerodynamic Design ; Initial Design ; One-Dimentional Modeling
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